using System;
using System.IO;

namespace Org.BouncyCastle.Utilities.Zlib
{
    /// <summary>
    /// Summary description for DeflaterOutputStream.
    /// </summary>
    [Obsolete("Use 'ZOutputStream' instead")]
    public class ZDeflaterOutputStream : Stream
    {
        protected ZStream z = new ZStream();
        protected int flushLevel = JZlib.Z_NO_FLUSH;
        private const int BUFSIZE = 4192;
        protected byte[] buf = new byte[BUFSIZE];
        private byte[] buf1 = new byte[1];

        protected Stream outp;

        public ZDeflaterOutputStream(Stream outp)
            : this(outp, 6, false)
        {
        }

        public ZDeflaterOutputStream(Stream outp, int level)
            : this(outp, level, false)
        {
        }

        public ZDeflaterOutputStream(Stream outp, int level, bool nowrap)
        {
            this.outp = outp;
            z.deflateInit(level, nowrap);
        }


        public override bool CanRead
        {
            get
            {
                // TODO:  Add DeflaterOutputStream.CanRead getter implementation
                return false;
            }
        }

        public override bool CanSeek
        {
            get
            {
                // TODO:  Add DeflaterOutputStream.CanSeek getter implementation
                return false;
            }
        }

        public override bool CanWrite
        {
            get
            {
                // TODO:  Add DeflaterOutputStream.CanWrite getter implementation
                return true;
            }
        }

        public override long Length
        {
            get
            {
                // TODO:  Add DeflaterOutputStream.Length getter implementation
                return 0;
            }
        }

        public override long Position
        {
            get
            {
                // TODO:  Add DeflaterOutputStream.Position getter implementation
                return 0;
            }
            set
            {
                // TODO:  Add DeflaterOutputStream.Position setter implementation
            }
        }

        public override void Write(byte[] b, int off, int len)
        {
            if (len == 0)
                return;
            int err;
            z.next_in = b;
            z.next_in_index = off;
            z.avail_in = len;
            do
            {
                z.next_out = buf;
                z.next_out_index = 0;
                z.avail_out = BUFSIZE;
                err = z.deflate(flushLevel);
                if (err != JZlib.Z_OK)
                    throw new IOException("deflating: " + z.msg);
                if (z.avail_out < BUFSIZE)
                {
                    outp.Write(buf, 0, BUFSIZE - z.avail_out);
                }
            }
            while (z.avail_in > 0 || z.avail_out == 0);
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            // TODO:  Add DeflaterOutputStream.Seek implementation
            return 0;
        }

        public override void SetLength(long value)
        {
            // TODO:  Add DeflaterOutputStream.SetLength implementation

        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            // TODO:  Add DeflaterOutputStream.Read implementation
            return 0;
        }

        public override void Flush()
        {
            outp.Flush();
        }

        public override void WriteByte(byte b)
        {
            buf1[0] = (byte)b;
            Write(buf1, 0, 1);
        }

        public void Finish()
        {
            int err;
            do
            {
                z.next_out = buf;
                z.next_out_index = 0;
                z.avail_out = BUFSIZE;
                err = z.deflate(JZlib.Z_FINISH);
                if (err != JZlib.Z_STREAM_END && err != JZlib.Z_OK)
                    throw new IOException("deflating: " + z.msg);
                if (BUFSIZE - z.avail_out > 0)
                {
                    outp.Write(buf, 0, BUFSIZE - z.avail_out);
                }
            }
            while (z.avail_in > 0 || z.avail_out == 0);
            Flush();
        }

        public void End()
        {
            if (z == null)
                return;
            z.deflateEnd();
            z.free();
            z = null;
        }

        protected override void Dispose(bool disposing)
        {
            try
            {
                try { Finish(); }
                catch (IOException) { }
            }
            finally
            {
                End();
                outp.Dispose();
                outp = null;
                base.Dispose(disposing);
            }
        }
    }
}
